Improvement in machine for bending- sheet-metal



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A. W. WHITNEY AND P. A. WHITNEY, OF WOODSTOCK, VERMONT.

.Letters Patent No. 83,347, dated October 20. 1868.

MROVEIMENT IN MACHINE FOR BENDING SHEET-MTM The Schedule referred to in these Letten Patent and making part of the lame.

To all whom it may concern:

Be it known that we, A. W. WHITNEY and I. A. WHITNEY, of oodstock, in the county of Windsor, and State of Vermont, have invented a new and useful Improvement in Machines for Bending or Folding SheetMetal; and we do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1, Sheet No. l, is a plan or top view of our invention.

Figure 2, Sheet No. 2, a side view of the same.

Figure 3, a side sectional View of the saine, taken in the linex x, lig. 3.

Similar letters of reference indicate like parts.

This invention relates to a newaud improved machine for bending or folding sheet-metal, designed for the use of tinsmiths and other' artisans in sheet-metal.

The object of the Vinvention is to obtain a machine for the purpose specified, which will be' capable of turning either a close, sharp lock, or a rounded open one, as desired, and perform the work in a neat and perfect manner.

A represents the base of the machine, which is provided with an upright ledge or projection, B, which forms the bed-piece, on which the sheet of metal rests while its edge is being turned.

O is the folding-blade of the machine, the rear part of said blade resting on uprights a a, the upper' ends of which are provided with tenons b, the latter extending through slots, c, in the folding-blade, with pins, d, passing transversely through the tenons.

The blade 0 also rests upon two bars, e e, the lower ends of which are secured, by pivot-bolts f, in bars D D, the front ends of the latter catching into recesses, g,4 made in the lower part of the bed-piece B, (see fig. 3,) the blade C being secured to` the bars D D by screws, h.

At the under side of the blade C there is a gauge, E, to which' a screw, F, is connected, said screw being fitted in a socket, G, underneath the blade. By turning this screw, the gauge' E may be adjusted farther forward or backward, according to the width of lock required to be turned or formed on the sheet of metal. This will be fully understood by reference to iig. 3.

H is the folding-bar, which is provided at each end with a journal, i.

These journals have their bearings I in yokes Ix IX, at one end of bars, J J, the front parts of which rest on uprights,jj', on the base, A. The opposite ends of these bars J J are fitted on shafts K K, which have their bearings ,in uprights, k, on the base, A, and the inner ends of these shafts are cut out at one side to form cams, l as shown in iig. 3, said cams bein directly over frictionrollers, L, in the rear part o the bars D D. g

On'each journal, i, of the foldingfbar H, there is tted a metallic strap, M, and the outer ends of these straps have oblong holes, j X, made in them longitudinally, through which pins, n, pass, said pins also passing transversely through arms, N, of the base, the outer ends of the arms being slotted to receive the straps M.

The bearings I may be adjusted further forward or backward in the yokes I IX, by means of screws O.

By having the bearings I, ofthe folding-bar H, adjustable, the edge ofthe folding-bar H may be adjusted nearer or further from the edge of the bed-piece B, as may be required.

On the outer ends ofthe journals t of' the folding-bar H, and also on the outer ends of the shafts K K, there are secured respectively arms, P P', which are connected by rods, 4

The operation is as follows:

In folding close or sharp locks on sheet-metal plates, the screws O are turned, so,as to bring the edge of the folding-bar H quite close to the outer edge of the bedpiece B, (see fig. 3,) and the gauge E, by means of screw F, is ,adjusted further forward or backward, according to the width of lock required. The edge of the metal plate, shown in fig. 3, is then inserted between the folding-blade C and the bed-piece B, and the folding-bar H, by means of an arm or lever, LX, i s raisedl or turned over, so that the sheet-metal plate will he turned over the edge of O, the latter being pressed down upon the edge of the sheet-metal plate, which rests on B, by the action of the cams lon the friction-rollers L, of the barsD. y

In order to fold an open lock, the folding-bar H is adj usted more or less outward from the bed-piece B, and of course a less angular bend or turn of the sheetmetal plate, around the edge of O, will be the result.

The straps M, it will be perceived, limit the upward movement of the bars J J andthe folding-bar H. The further the folding-bar H is adjusted outward from B, the greater is the rise allowed the folding-bar H.

Having thus described our invention,

We claim as new, and desire to secure by Letters Patent- 1. The folding-bar H, in combination with the bars J J, arms P P', and connecting-rods Q, all arranged to operate in the manner substantially as and for the purpose set forth.

2. The straps M, in combination with the foldin g-bar H, adjustable bearings I, and screws O, all arranged to operate in the manner substantially as shown and described.

3. Holding the folding-blade U upon the work on bedpiece B, through the media ofthe cams l, friction-rollers L, and bars D e. all arranged to operate substantially as set forth.

4. The gauge E, arranged and applied in connection with the screw F, substantially in the manner as and for the purpose set forth.

A. W. WHITNEY. P. A. WHITNEY. Witnesses:

' H. V. FRENCH, H. T. Masse. 

